.app-header {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin: 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.navigation {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 2rem;
}

.nav-link {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: all 0.3s ease;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .header-container {
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-list {
    gap: 1rem;
  }
  
  .nav-link {
    padding: 0.25rem 0.5rem;
    font-size: 0.9rem;
  }
} 